c-- ccc cce ccp ccs cct ccx ce- cec cee cep ces cet cex cpc cpe cpp cps cpt cpx csc cse csp css cst csx ctc cte ctp cts ctt ctx cxc cxp cxs cxt cxx ec- ecc ece ecs ect ecx eec eee eep ees eet eex ep- epc epe epp eps ept epx es- esc ese esp ess est esx etc ete etp ets ett etx ex- exc exe exp exs ext exx p-p pcc pce pcp pcs pct pcx pec pee pep pes pet pex ppc ppe ppp pps ppt ppx ps- psc pse psp pss pst psx pt- ptc pte ptp pts ptt ptx pxc pxe pxs pxt scc sce scp scs sct scx se- sec see sep ses set sex spc spe spp sps spt spx ss- ssc sse ssp sss sst ssx stc ste stp sts stt stx sxc sxs sxt t-x tcc tce tcp tcs tct tcx te- tec tee tep tes tet tex tpc tpe tpp tps tpt tpx tsc tse tsp tss tst tsx ttc tte ttp tts ttt ttx txe txs txt xcp xcx xee xep xes xet xex xpc xpe xpp xps xpt xsc xsp xss xst xtc xtp xts xtx xxp xxx